A door lock system for vehicle doors includes a lock mechanism including a switching lever. The switching lever can be moved freely between a neutral position and a locking position and between the neutral position and an unlocking position. The door can not be opened when the switching lever is moved from the neutral position to the locking position and can be opened when the switching lever is moved from the neutral position to the unlocking position. A link unit that receives a lever operation force from outside of the door and conveys the lever operation force to the switching lever. A holding unit holds the switching lever at the neutral position when the link unit does not receive the lever operation force.